If you were wanting a non-Apple device, the best flying tablets are the Huawei
M3 and M5.
As for wifi and cellular, Apple confuse everyone because they only include GPS in their cellular iPads while just about every Android device has GPS.
However there are only two flight functions that can use the GPS in your tablet.
They are Follow-me and resetting the home point to your controller's current location.
Active track works better than Follow-me if you are into that sort of thing.
Resetting home to the current location of the controller is mostly used if you are flying from a moving car or boat and even then is not necessary.